This is an upstream bugfix which resolves numerous issues. For full details, refer to the upstream release notes:
http://projects.puppetlabs.com/projects/facter/wiki
In addition, this update applies a backported fix for the virtual fact when facter is run by a non-root user:
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This update has been submitted for testing by tmz.
This update is currently being pushed to the Fedora EPEL 5 testing updates repository.
This update has been pushed to testing
This update has been obsoleted by https://admin.fedoraproject.org/updates/facter-1.6.18-3.el5